databaseChangeLog:
  - changeSet:
      id: 0012-drop-unique-tx-gateway
      author: JJO

      # ✅ Solo ejecuta el changeSet si existe la UNIQUE constraint
      preConditions:
        - onFail: MARK_RAN
        - uniqueConstraintExists:
            tableName: payment_transactions
            constraintName: idx_payment_tx_gateway_txid

      changes:
        # 1️⃣ Eliminar la UNIQUE constraint si existe
        - dropIndex:
            tableName: payment_transactions
            indexName: idx_payment_tx_gateway_txid


      rollback:
        # 🔙 1) Eliminar el índice normal creado en este changeSet
        - createIndex:
            tableName: payment_transactions
            indexName: idx_payment_tx_gateway_txid
            columns:
              - column:
                  name: gateway_transaction_id